Attachment-plug cap.



L. H. MOULTHROP.

ATTACHMENT PLUG CAP.

APPLICATION FILED NOV. 23, I916.

, Lwbfiifiw. Patented. Feb. 26, 1918.

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an crane 'nr FTFW LEMIBERT H. MOULTHROP, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO H. T. PAISTE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF I PENNSYLVANIA.

ATTACHMENT-PLUG- CAP.

neamao.

Specification of Letters Patent.

Application filed November 23, 1916. Serial No. 133,042.

tact members and their associated parts,

and which shall have said members and parts so disposed as to permit of the con-' ductors bein run into and retained in said cap in position to prevent the transmission of tension to their ends which are directly connected to the fixed contacts.

A further object of the invention is to so form and dispose the securing means for certain of the contacts in an attachment plug that suflicient space is available for the provision of a so-called cord-lock, whereby any strain on the conductors is transmitted directly to the body of the plug structure rather than to the contacts or those parts of said conductors attached thereto.

I also desire to provide an attachment plug with novel means for holding its fixed contacts in place, the invention contemplating a construction in which the. holding members are designed to not only immovably hold the contacts but also receive binding screws. I

' Another object of the invention is to provide a novel construction of contact which shall serve as a means for retaining in place the fiber disk which covers the conductors, the contact being also formed to allow of free access to the side of itsbinding'screw in order that it shall be possible to properly place under its head the strands of the conductor which it isto hold in place.

These objects and other advantageous ends I secure as hereinafter set forth, reference bein had to the accompanying drawings, in w ich,

Figure 1 is a side elevation of an attachment plug cap constructed according to my invention;

Fig. 2 is a plan of the cap shown in Fig. 1;

Figs. 3 and 4 are sections taken respectively on'the lines 3-3 and ie- 1 Fig. 2; and

Figs. 5, 6 and 7 are perspective views of parts of my invention.

In the above drawings 1 represents a hard rubber or other insulating body formed to the shape required for a cap of well known form of attachment plug and having a somewhat semispherical form with a relatively large recess or opening 2 at the center of its convex portion for the reception of theend of an insulated cable 3 in which are contained the conductors 4 and 5 leading to said cap. The flat face of the body is provided with a narrow peripheral flange 6 and has formed in it two substantially circular and oppositely placed recesses 9 and 10 into which extend a pair of externally flanged, internal] y threaded bushings 7 and 8. These latter are molded into the body 1 so as to be immovably held and extend respectively through rings 11 and 12 over which they are 2. The bushings g and 8 have binding screws Patented Feb. 2%, Tilin 17 and 18 respectively threaded into them so that they not only serve as sockets for said screws but likewise retain the terminals in place. The recesses 9 and 10 have comparatively tortuous channels leading from them respectively to the central passage 15 and lying for the most part substantially parallel to the plane of the flat face of the body 1 the arrangement being such that there isin each passage asharp wedge shaped projecting edge or corner 28. Each of the contact portions 13 and 14 of the terminals is recessed on that face adjacent its ring 11 or I 12, as by pressing it outwardly in order to provide a space between the head of its binding screw and the adjacent face of said contact, this being provided in order to facilitate the introduction of a screw driver between these parts when the strands of a conductor are to be placed in position to be properly engaged by the binding screw.

The outer face of each of the contacts 13 as indicated at 20, for the reception of cor-- respondingly formed projections of a cooperating contact carried by themain part of the attachment plug (not shown). Each of the contacts has at least one of its edges provided with a projection 21 designed to engage a fiber disk 22 formed to fit within the flange 6 and having openings 23 for the passageof said contacts, the projections 21 being placed at such a height on the contacts as to extend over the outer face of the disk when this has been brought to a position with its outer face flush with the outer surface of the-flan e 6.

The two con uctors 4 and 5 of the cable 3 are led through the reduced passage 15 and are then forced into the passages 9 and 10 in the flat face of the body 1 so that their bared ends may be carried around the. screws 17 .and 18. These latter are then set up in their bushings and tightly clamp said wires in place. The relatively sharp edges 28 in the passages or channels 9 and 10 cause any pull exerted upon the conductors 4 and 5 to be transmitted to them so that it is practically impossible to pull said conductors loose from the binding screws.

It is to be particularly noted that by providing bushings 7 and 8 which serve to retain the contacts inplace as well as act as sockets for the binding screws, there is provided suflicient space in the flat face of the cap for the tortuous passages 9 and 10',

where ordinarily it is necessary'either to embed the base of each of the contacts in the molded body 1 or to provide the contacts with lateral extensions for the reception of the binding postsftogether with screws whereby said contacts are held to said body.

I claim 1. The combination in an attachment plug of a structure-of insulating material; bushprojections to rigidlythold said contacts in place; with bin the bushings.

3. A cap for an attachment plug formed of insulating material and having two deng screws threaded into pressions in one face; contact plates projecting from said cap and having annular projections respectively extending into said (1 pressions; internally threaded bushings molded into the body of the cap and extending through the annular projections of the contacts so as to hold them in position;

with binding screws threaded into said bush- {1;}. The combination in an attachment plug formed of insulating material and having two depressions in one face; contact plates projecting from said plug and having annular projections respectively extending into said depressions; internally threaded bushings molded into the body of the cap and extending through the annular projections of the contacts so as to hold the contacts in position; with binding screws threaded into said bushings; said cap having a central 'opening and tortuous passageways leading therefrom to the depressions respectively.

5. The combination in an attachment plug of a pair of projecting contact strips each having an edge projection; conductors extending into said plug and attached to said contacts respectively; with a plate of insulating material fitting over said contacts against the face of the cap and held in position by the projections of said contacts.

6. The combination in an attachment plug of a body of insulating material; a pair of contacts projecting from one face thereof; conductors extending into the plug and connected to said contacts respectively; the contacts having their edges notched to form projections adjacent the plane of the face of the cap and a plate of insulating material fitting against said face and removably held in position by said projections.

7. The combination of a body of insulating material; a relatively stiff inflexible contact projecting therefrom and having a shoulder; a conductor extending in said insulating body and connected to said contact; with a plate of insulating material perforated for the passage of the contact and normally held adjacent the insulating body by the shoulder of said contact.

8. The combination in an attachment plug of a flanged body of insulating material; a pair of substantially flat contact strips projecting from said body and respectively having edge projections adjacent the plane of the flange thereof; terminals for said contacts withinthe body; with a plate of insulating materialfitting within the flange of the; body so as to cover said terminals and perforated for the passage of the contacts, said plate being maintained in place by the projections of said contacts.

9. The combination of an insulating supporting body; a contact mounted thereon having two portions substantially at right angles: with a binding screw mounted in one of said portions of the contact, the other .portion of the contact being recessed immediatelv adjacent the screw so as to space it awav from the same.

10. The combination of an insulating supporting body; a contact mounted thereon having two portions substantially at right angles; with a binding screw mounted in one of said portions of the contact, the other portion of said contact being pressed out- 5 wardly immediately adjacent said screw to provide a space between itself and the head of the screw.

11. A cap for an attachmentplug having an insulating body; two substantially permit lel contact strips respectivel having portions fixed to said body; with inding screws mounted in said portlons, the contact strips being pressed outwardly toward each other adjacent their respective binding screws.

LEMBERT H. MO UlL'lPmUP. 

